What is the best way to find someone to rehome my tropical fish?

Hello,

I've had my fish for about a year and a half now and in that time I have learnt lots, but also had a lot of failures. It is so sad when my fish get poorly and I'm finding it really difficult to look after them properly.

My pangasius catfish (which the shop should never have sold to me!) is now really poorly and I just don't know how to look after him properly.

I'm moving home in a couple of months and have decided that they would be better in a new home with someone who knows what they are doing. I don't want to take them back to the shop but can't seem to find anywhere online that is suitable for rehoming fish in Bedfordshire.